Cam card for Mopar Purple shaft 284 cam p4120653

Joe's link is the Victory site and has the cam data... which it sounds like you have. Yes, the opening and closing numbers on that page are at low lift and I would assume are tappet measurements (.004" or .005" or .006"; I dunno which MP used.)

If you can measure and give us .005" tappet opening and closing angles for both sides, then it is easy to back-compute the ICL. (And remember, your lash will reduce the actual durations if you are measuring at the valve; openings will be later and closings earlier at the valve. It sounds like you know this already.)